The SPservices uses a lot of ajax calls to communicate to the Soap services in SharePoint, for example in the version 0.5.8 lines 1659, 929,1088, 2226, etc.

I was thinking, it would be nice to add a SP.UI.Notify before and after each $.ajax call to show to the end user that a synch operation is happening in the background. Or leverage the $.ajaxStart() and $.ajaxStop() to call the SP.UI.Notify. I notice SharePoint
take a long time to answer some of the SOAP calls. And SP.UI.Notify is a nice addition to the script.

Like I said, if it is not in your plans, I volunteer to add this feature, QA and send the code for you to post here at codeplex.

Thanks a lot for this JS library, it is amazing the number of hours you guys put in this and make available to the community.